code: def test_without_color():
      style = Style(bold=True, color="red", bgcolor="blue")
      colorless_style = style.without_color
      assert colorless_style.color == None
      assert colorless_style.bgcolor == None
      assert colorless_style.bold == True
      null_style = Style.null()
      assert null_style.without_color == null_style
  
imports: import pytest
  from rich import errors
  from rich.color import Color, ColorSystem, ColorType
  from rich.style import Style, StyleStack
label_desc: Use image node_id 22 for calling a global function with example usage: test_without_color() without return types